I'am have no experiences with writin C++ apps but on the python side you have to set the prefix paths and init qgis at app start. Otherwise you'll get strange errors, like yours.
QgsApplication.prefixPath() --> get your path from a working QGIS python console
QgsApplication.setPrefixPath(<path>, True)
QgsApplication.initQgis()
QgsApplication.initQgis()
Hope this helps.
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